User's Manual
Table Of Contents
- 1 Introduction
- 2 Unit Descriptions
- 3 Installation Guidelines
- 3.1 General System Specifications and Requirements
- 3.2 Infrastructure Preparation
- 3.3 Antenna Specifications and Guidelines
- 4 IHU Installation
- 4.1 General Installation Information
- 4.2 IHU Installation
- 4.3 Grounding Chassis
- 4.4 RF Connections
- 4.5 IHU Fiber Connections
- 4.6 Management Connections
- 4.7 Power Connections and Power Up
- 4.8 Verifying Normal Operation
- 5 PSU6 Installation
- 6 MRU Installation
- 7 Appendix A: Specifications
- 8 Appendix B: Ordering Information
Corning Optical Communications User Manual I CMA-490-AEN I Page 78
6.2.5 External Alarm Connections
Note: Also refer to relevant section of the Purcell Systems cabinet installation manual (i.e. “Connecting Optional Custom
Alarms”).
A DB-9 female pin “External Alarms” connector (located on optical module below RJ45 ports) provides support for up to three
external dry contact alarm connections from external sources (incoming outputs). See Figure 6-19. The connector provides
indications for door opening, heat exchanger (HEX) and one additional input for future use.
Figure 6-19. MRU External Alarms Connector and Cable
To perform external alarm connections
1. Connect the external alarms cable (ordered separately) to the chassis’s DB9 “External Alarms” connector. Refer to
Table 6-5 and to Figure 6-20 for pin out information.
Pin Description
1 Common
2 Not connected
3 Not connected
4 Not connected
5 Not connected
6 Door alarm
7 HEX (heat exchange) alarm
8 Future alarm
9 Exist indication (indicates existing
connection of alarm cable)
Table 6-5. MRU External Alarm Connector Pin Out
Description
Figure 6-20. MRU External Alarms Connector Pin Out
2. Route the cable alarm wires to the alarm block, located on the upper right corner of the cabinet. See Figure 6-21.